Chicago, IL

Zoning & Building Rules in Chicago, IL

Chicago has a complex zoning code with 12 residential and 5 business district types. The city is expanding its ADU pilot program and promoting transit-oriented density.

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Key Facts About Chicago

Population
2.7M
ADU Status (IL)
varies
Median Home Price (IL)
$275K
Common Zones
R-1, R-2, C-1, C-2
Zoning Overview

Chicago uses a conventional Euclidean zoning system with Residential (RS, RT, RM, RX), Business (B), Commercial (C), Downtown (D), Manufacturing (M), and Planned Development (PD) designations defined in the Chicago Zoning Ordinance (Title 17). Chicago also makes extensive use of Planned Developments (PDs), Transit-Oriented Development (TOD) bonuses, and Affordable Requirements Ordinance (ARO) mandates. Check any Chicago property with ReadyPermit.

Source: Chicago Department of Planning and Development (DPD)

Zoning Districts in Chicago

RS-3

Residential Single-Unit

Single-family homes, ADUs (2020 ordinance)

RT-4

Residential Two-Flat

Two-flats, single-family, ADUs

RM-5

Residential Multi-Unit

Apartments, condos, up to 5 stories

B-3

Community Shopping District

Retail, restaurants, offices, residential above

C-1

Neighborhood Commercial

Small-scale retail, services, mixed-use

D

Downtown Districts (DX, DC, DS)

High-rise office, residential, mixed-use, hotels

M-1

Limited Manufacturing

Light industrial, warehouses, some commercial

PD

Planned Development

Custom-negotiated uses, density, and design (council approval)

Development Standards

  • RS-3: 2,500 sq ft min lot, 30 ft height, 0.9 FAR, 2 ft side setbacks
  • RT-4: 2,500 sq ft min lot, 38 ft height, 1.2 FAR, two-flat and ADUs
  • RM-5: 50 ft height, 2.0 FAR, mid-rise apartments
  • B-3/C-1: 40-50 ft height, ground-floor commercial, residential above
  • TOD bonus: increased FAR and reduced parking within 600 ft of rail stations
  • ARO (Affordable Requirements Ordinance): 10-20% affordable units for projects receiving city subsidies or zoning changes

Permit Process & Timeline

Timeline

4-8 weeks for standard residential; 6-18 months for Planned Developments

Permit Costs

$2,000-$10,000 for residential; $25,000+ for commercial PD

  • • Department of Buildings (DOB) handles building permits
  • • DPD handles zoning approvals and Planned Developments
  • • Planned Developments require City Council approval (aldermanic prerogative)
  • • Aldermanic prerogative: local alderman holds significant influence over zoning changes in their ward

How to Check Zoning & Get Permits in Chicago

  1. 1

    Check your zoning

    Use ReadyPermit or the Chicago Zoning Map (secondcityzoning.org or gisapps.chicago.gov) to find your zone district, FAR, and any overlay designations.

  2. 2

    Determine approval pathway

    By-right projects go to DOB. Planned Developments require DPD review and City Council approval. TOD projects may qualify for bonuses.

  3. 3

    Submit to DOB

    File building permit application through the Chicago DOB E-Plan portal with architectural drawings and site plan.

  4. 4

    Plan review

    DOB reviews for building code, zoning, fire, and accessibility compliance.

  5. 5

    Aldermanic review (if applicable)

    Zoning changes and Planned Developments require local alderman support and City Council vote.

  6. 6

    Pay fees and obtain permit

    Pay building permit and applicable impact fees.

  7. 7

    Construction and certificate of occupancy

    Build per approved plans with required inspections. Obtain certificate of occupancy.

Zoning & Building FAQ for Chicago

How do I check zoning in Chicago?+
Use ReadyPermit for instant results or the Chicago Zoning Map. The city's GIS system shows zone district, FAR, height limit, and any Planned Development or overlay designations for any address.
What is a Planned Development (PD) in Chicago?+
A Planned Development is a custom zoning designation negotiated between a developer and the city. PDs allow flexibility in density, height, and use beyond base zoning, but require City Council approval. Most major Chicago developments use PD zoning.
What is aldermanic prerogative?+
Aldermanic prerogative is Chicago's informal tradition where the local alderman holds significant influence over zoning and development decisions in their ward. Practically, most zoning changes require the ward alderman's support to advance through City Council.
What is the TOD bonus in Chicago?+
Transit-Oriented Development (TOD) bonuses allow increased density (higher FAR), reduced parking requirements, and other incentives for projects within 600 feet of CTA or Metra rail stations. TOD is a major driver of new development along transit corridors.
What is the Affordable Requirements Ordinance (ARO)?+
The ARO requires developers receiving city financial subsidies or zoning changes to include 10-20% affordable units or pay an in-lieu fee. The requirement varies by ward and project type. ARO is a key component of Chicago's affordable housing strategy.

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